Haryani, D., Subagjo, A., Hamdani, M., Ali Hasan, Q. dan Widyanti, N. 2022. ANALYSIS OF THE DIFFICULTIES OF CLASS X STUDENTS OF SMKN 4 PALANGKA RAYA IN SOLVING TRIGONOMETRY PROBLEMS. JURNAL PENDIDIKAN. 23, 1 (Jun 2022), 29–38. DOI:https://doi.org/10.52850/jpn.v23i1.4667.